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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e47b1659c38528b53a621d6a996f7b846c915ec299754e117cd67bfb8cdc829' 
  AND token = 'GniVW/v9uY32uNvWwhZMDDMEYN2EX40lvTnhIn4IicE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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