SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096a52d0ae7c1f658cc4512427132a457879623e81077dabb6451cf9978ba60b' 
  AND token = 'RvbE2gNM28zUOOqvnPc1doNSPVSuq/g9XsCgyMKlVhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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