SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ff8160b098fa8da0e191bb060766ceac5338f63cd67d46a2402962a9d5e076' 
  AND token = 'q4f/TYj+Nol+xPIp6g+yIvqweSGX/EVCfemUyZ+1vMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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