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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5262858ef9f56e34a5dbacd843fa6f93fa63d7d2d7be3ff2d06a18bc84fd5351' 
  AND token = 'bdMYRV4Xdz/DmSoTneDvj3TxFE8diuzq8P9mQBpX53k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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