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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30726e87e3b62a92da586a343067ca072dca3eb0298b9804e68392fdd4bb5a6c' 
  AND token = 'WJDFVgfJJW7ZxXzBIclhi9ezysQQDaB2hKNGQHh6f8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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