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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7197803f9ccf73469ff939ef6ffdbca7942eea3118432b2ccb085c34eb9d2b29' 
  AND token = '4IvizDd+0Oxe2NlCbNKrgs8Mie8w7Nt3jcDid3C3P7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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