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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d2b9ab1b925673afdb61e729fce52d0ec9ac9a77034db904dafec89ff59cdd' 
  AND token = 'qel1ga2Li29OyJsSC041CCGmKCTcnk+BEGV5PANqzo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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