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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67c5227a91f8d727c6cac635ea50b8c55be9993beba9365f2e879b3eabfa987' 
  AND token = 'nSvEZIaByLqUHU37foQO8vHA5aRj/reESB58Wh+7JtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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