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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a4e3b5a9531e1cbfbbaf265c1ce1518b8bc558596f63a0e76a1efb4984178f' 
  AND token = 'c96IBcGPm7CE6u6FO7Yykl7CIbrumAZHzDPdSaUI5AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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