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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5242d296bb8f28c4d96c72ff68ef7c64275c051263df891c3fb004b8d7faea41' 
  AND token = 'uAOW+p97/8IJEdnVINJmkNkQ4u8A9VAFJvDo1ox5nTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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