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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79dbfefc97f034a1715b9fd805b9aee82724e55b35c8907a433fcd548546552' 
  AND token = 'jPNIsgRRkW5MJB95ZxRTP6A9Y0rqW5y0LttpbMEjPU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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