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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce3a9f4a725ab064a102954e00d5f6a29526d76d78d08a03554d99bb8a7c8d7' 
  AND token = '8bbZChhy37ViRjoLBOrqrdiLl7R5ZKVYTZjNQgZsKNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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