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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cacc90d17b91ede6288251c1204acf06213c5c6598c658849179b4dee093c3' 
  AND token = 'qBcF1kQ9Mmw1B8Ysl/SlizWwoiZ8sZU0dG39Qtuc7o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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