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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796c53708a38e9844ac7d05087e97999d8962ddb4d9cee960a86da798bed3077' 
  AND token = 'wSr24LsG/tguEhw17r3Td+QQ8rdMjcNh0n8erPdQoYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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