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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480c806a87006b280252c1962d8b23ccb7f61dc0dc2168bb6fd4e35c5d6c484e' 
  AND token = '8n2r2r6sRDh8qBzKBQO9efXCZ+xr5BQJsAlD5Ap0S6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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