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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e177d87f4b5f05f282872ebe8c9cb490014cccd0da0cb8560b46d2fde739adcd' 
  AND token = 'acsvM7RtxvBA6JNu/xfITZb9xAp2iTjBPU+VHPHEkvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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