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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe6594518c98df5945136a731ba4d6e0b5cce19f66b0a8b8dbf8f5d0740d727' 
  AND token = 'LW+j9HeNUY+bLeD9RuNm3uP4ABc6j20ybP+cQeB1l64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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