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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da75f216f41c97fe99fb9cda031bffdf70979759a8d3ae5dc0f2e3dc63a9bff4' 
  AND token = '7vY95Vy/bxJ6SnZMxFlgrGTJJ9c7tPuaZva2rPVOuQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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