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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6216b154f1b92d55b5f9466c5e17641cca9f8903d5f93e20fde8dadcd674b8' 
  AND token = 'JpCLQcd6JavH9NM4L0wNWymiMQsU7SzuF5V0nUzHIdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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