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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2097429e6db9cf66a025ea57d9972a17d5cf3bb253cbaacbbfa9242b56e417f' 
  AND token = '7SvPxV0wa//jAeSRpf9KlyJwxU7jREPbW+V4DulSYBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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