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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86c86d6c907d739e5863b0cca5e2c92b3a3d48f97d2a37b083dedc9b3b140c1' 
  AND token = 'olnYlkgLYOPFXM0nrQogvadbWJ58kwoqiOCSKjfm46E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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