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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3936566494eca4649d7c8b6ac0dbe314c616975179da47e9392e63923197df' 
  AND token = '/qtBMbE7660taxUY6AJbxTsWGnqbpamMdM7HFGW2zzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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