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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5952b7ea3493b672cbdd65250c64bae11765762a42ba9dc3a0ca3096e44657' 
  AND token = 'JPhyRAwZoFIf9GNc27aW7OIn2CSJs6KjFa14wFoRmUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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