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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec6dd4e1c5a62565b3eb463094dd2ad01050a410a6ace4babd11b39d174998e' 
  AND token = 'HHSff0+cAZkpD76LQMZyEE6go3RB3XTrIbtWIqvVwDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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