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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82658ec580ed827225e65f38144dacecc9523b7c86299ad2aa9393f05df5066b' 
  AND token = 'kJ1xZfw3Ci06mUi9dF96UTmmgvTJB35eHtO5+NE/L1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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