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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a919d22693ddaff46f95a36729e9c44ab077e601026d78de0c381afb400e3718' 
  AND token = 'T79hC2qS9v1sbDmtDGal/WPIDmnC9BOXGq4szlJ9ngI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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