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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9681f556c28048f71f40d228406699fb574e642bddb8f2d0fde4c06517d011b' 
  AND token = '6UKEm69Y6h5a7j4G6XLnRay4V4ggsNIvpQ4f/DeKo0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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