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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9625e4ce0629f234e69b4b08c8e5e765314c3c52cf5c6104a47176a2c2bf902' 
  AND token = 'tf6HzDpks2oc/tGVRT9TRkvOXCO1ij7mdNtZqES1KaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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