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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b1e6fc56614efc58e26a1f9e5960b4feb887b4cd440a1ef094b6114e21fa02' 
  AND token = 'vvm6F4UzKgMjAxZAIL4wUglZcmmSjkG3TKWf7sMy1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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