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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f94eeff7ffa0518438488cea69fb08eb75e0965fd8ff360e0760169af80344' 
  AND token = '8ply6hV6BXpTfcfGK3UcKUwVJVCOAYwxrAOt3u5rJmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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