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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73dda1fee06ed7fa723d8bc9a01ed3120dd96873d9a2b0d31e1700e81449d5f7' 
  AND token = 'k9u3TI9TJp9qLfuveIHA65EgixqyrcQzSViAe3F2kek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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