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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c193fb5cbae50eb0ac1e8f554cdeb503162b86b57dcf3123998a369ca663d466' 
  AND token = 'U8XpgqFovLTA97Eh1LgZW6S7ccmBuK22Dgw8mX4ma7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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