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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39c3a2b739d0e25598add067c6f42fa263f49c9989d4fafa767e1a6670b3280' 
  AND token = '4FmQb6R4bh7iml+cFU6d1hdPn6ISgzz+WY5pcztmdiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}