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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eb7cb52ed85288c9a72df4abb800fae2d6b2603c969df78dff06ad55ec5bfb' 
  AND token = 'TFdK+8+smwggVFK6sW76Liln8FqClOL0YHxFQ5I4OMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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