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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb200ae6ca04fefb052bbe0850c398fd1c4191922359d7f70b1ec6219d36ee4' 
  AND token = 'l9bTbbmCLxLf3gxRY9YTAt3e2YE1fRZVRl0sazSeaWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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