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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc020d55b2393f566b2f03405fcc8ae96a76c74a3d06212199142398c667ae57' 
  AND token = 'zyLUJc7fwLJ/tp7o8L92rwUZ9RGOddSuZkL2z9PTTXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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