Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a2df6eeb965eee50c78990a05ad58af20d2783a7b2769084375aeb23ed633a' 
  AND token = 'SqTUPgq97QcuNBqsVTrIKscRZhW6OMfoIT89WmFrsI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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