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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5b9e815819e51e8495f0d5f74ec088389e2ebc34fc8dcbf2726bae0320ae2b' 
  AND token = '6/NuaWf8WDZ/02r/bclHxMqDeYhuMr6xoMhamWEPxSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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