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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0355b9b2b8acab4cd024d5f012ee661af7f9f469d45742a6967f041e36a2b3c3' 
  AND token = 'DbMbsOu2KntQd/1Owsl8rv3n5ueb6j8cwdta6MXJaR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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