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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b244cca20c4c3ec9dec1eadae7f0fc1e99a839b4153ec6d81da1bdf1bdaeeb6a' 
  AND token = 't+ulLReyA75egY/WxRt3bqB1fQsKS+AkoY++iFapE8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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