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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdaa5f372466930b637f75ac02b1526ff115fa85c8d4a5c1d1fb7e5df0e82c9' 
  AND token = 'zLqU/Nra942+QmvbiDbxm1NKZmEicDkcBAkXTC0EI/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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