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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff664aaefd4841128d8f3c804ed1c609580c9c40c063140c284a6cb8c53c5b2' 
  AND token = 'Dm9yPG74gSYkHSWhqGn62Am1xjmrbHbx4ov9ojUr0wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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