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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5926b5f011eb6d15b734c15ca09b723b7dc59e2c72f2ea3bda6813b11c44b8d9' 
  AND token = '7byhjFEOuX6L86rAuEaMnG1mzUESCCLz0KNukBLzH+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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