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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae17df68a66788c9015b49dcac7f6fa4a607d8d0c063298f07fa15d1bd54bbb' 
  AND token = 'zekye2BX5L7UBFRpg3pqWSxIgT1V1BQdbNIzypdFI4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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