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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04379c1dc2cfcb8c8ca18a810b37572941d8b9c4b8558eca11ea4dbcf3a2f51' 
  AND token = 'r5wY6arnPtYJLbucYJFsLEepockz4iZj/xCFXO/ixhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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