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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca56666ab34115aa932b2effe6ee1ee3bd1c4b94c1cd7c2b853914d7ec996364' 
  AND token = 'DrCBHYRWOpCPHZ54J4/PvGKjW+n9xYtpUXjHknFSn94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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