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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b50a35950b7846e1c0343818fbda4c2440624e45f9b129bb8fac2e717638d7' 
  AND token = 'nSloCPspfr3zE8798CXteW0i8LeRZigR7M2MSHdauF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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