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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e69b13e3d276194e417f538e4350598c92205d9e064fc71d5c02e0e54e1714' 
  AND token = 'qquTwtr6jrtW66clghPZgfwnAe9+Eh3ytg8azpNS5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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