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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a804e81f67367073923fdbe6d6ebc8192aa1fbdda13f8aa9724051a9e69bc7' 
  AND token = 'AlwWJ0JYz3MOwEIjsZsM/i6xIHC1hW6+4g3y3MX13xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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