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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e8a9acf1d6142a851c206350a3c7f34d0dae02f53b39729c9667f30a502b07' 
  AND token = 'amubwz5tIyYNrUkMPwa4kCtLeYxmHUYnCGrMHU6lGYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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