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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a0f4c1da2bf2191b048f35cf764bf3139368ee633613b92756677c1d7b4e13' 
  AND token = '5qI6UupkHmRomcl57u0QfjBiOi7LyGUDRD6hBX2kZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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