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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff83f099ad1ff4a5dcc9c999e8f347c5522304a26a9a4c7fb7c7be996d237c3b' 
  AND token = 'WmzT5oCAx6ocRtD92S2Jb/dgzvQYYcM/CUYAEZqBK24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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