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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3de693d23be3f9d7500f6c6fa0420ff387b687eaa9119d7bdc50d7e5d2ef79' 
  AND token = 'KWrKQAlKGf21ajSl5FMfDhW1YyZwUKoeEif1FnyeZTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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