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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544ad62e806bd13db0bb9b40ac5f9b0dd7a9c7d3d7bd5938fc25e283a5250292' 
  AND token = 'tDpp9q0h8zdqvU04aQ1ptPrXfIVcKgNCj5hibXnSW5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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