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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3db04c2b2d97acfecc84c42ea0095cf6d5839f855689db4c38bde8c4f57ddc7' 
  AND token = 'I5TeERy5B9capBFBJwMakdpKkkVhRhSXMjXVZB647kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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