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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c894a1f2717134fd333b0231c95e9b3dcb7d55de0fd2f73263d2639334da8f0' 
  AND token = 'ok+g4FAl4MWbLw41cZ6Smf4mLbcDhPWHEf3LRmT+1HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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