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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd9000908cdf7aa8ed2d8f84956aa50c1683607d08b0a9546e94d9b7afceb7e' 
  AND token = 'w4j8QvgipcZ+Sce19PIsaowCRJXOhhNzTSMHJbLGnYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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