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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4f75875c8247e6225f8bbeecbc445e7a9bb527ff94e5cfefdad5cc2bba045f' 
  AND token = 'syWdfty8iE3yzsRr+2wsyv5f6mS3H/5c5Y0XuP2mMHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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