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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967d8f722acfc7ce051521571b619d93893754e95e6dcf83d467b1d608a28401' 
  AND token = 'xWJYD+wbxAAtT5g6axNEEYU3dJcm73demXxYrqiQ7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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