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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe608e9cfe00289c30d2ae29a7c7b94eb77e58943053683630af20dd710ce55' 
  AND token = 'LbCMJQjP5FO1fS54yRQTkMbTkrXKiAl34esnm1RDgjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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