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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b3ee0573dc88015a145c46fd05d847e794c232f35ebd6452cb35943a38a588' 
  AND token = 'CqNvdnHjXCcMfY8/zu7PSca+CjsJvdm2KK1+Q06qSX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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