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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ff57ff43239c9641067298b86b8fef4e8cdbe058f010be459850f787d9efb5' 
  AND token = 'e5MKt6A3KHgrJ9EEZmPGHf2Ztdqve4fUvsIgLm7/km0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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