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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1f8fea4de44a1a8c09f5c6c845a049bc68c79d36aa0a33f90472f8341cf57d' 
  AND token = '/Y0ZtZfC+rWqaKLjF5s3htzJ/+b0DtvUNvWzknDUDX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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